AWS Kubernetes

AWS Kubernetes is a Kubernetes cluster deployed using Kubeadm tool. It provides full integration with AWS. It is able to handle ELB load balancers, EBS disks, Route53 domains etc.

AWS Kubernetes

Updates

17.12.2017: Update to Kubernetes 1.9.0, update Dashboard, Ingress, Autoscaler and Heapster dependencies
8.12.2017: Update to Kubernetes 1.8.5
1.12.2017: Fix problems with incorrect Ingress RBAC rights
28.11.2017: Update addons (Cluster Autoscaler, Heapster, Ingress, Dashboard, External DNS)
23.11.2017: Update to Kubernetes 1.8.4
9.11.2017: Update to Kubernetes 1.8.3
4.11.2017: Update to Kubernetes 1.8.2
14.10.2017: Update to Kubernetes 1.8.1 and fix bug with passing subnet IDs list
30.9.2017: Update to Kubernetes 1.8
28.9.2017: Split into module and configuration; update addon versions
22.8.2017: Update Kubernetes and Kubeadm to 1.7.4
30.8.2017: New addon - Fluentd + ElasticSearch + Kibana
2.9.2017: Update Kubernetes and Kubeadm to 1.7.5

Prerequisites and dependencies

AWS Kubernetes deployes into existing VPC / public subnet. If you don't have your VPC / subnet yet, you can use this module to create one.
- The VPC / subnet should be properly linked with Internet Gateway (IGW) and should have DNS and DHCP enabled.
- Hosted DNS zone configured in Route53 (in case the zone is private you have to use IP address to copy kubeconfig and access the cluster).
To deploy AWS Kubernetes there are no other dependencies apart from Terraform. Kubeadm is used only on the EC2 hosts and doesn't have to be installed locally.

Including the module

Although it can be run on its own, the main value is that it can be included into another Terraform configuration.

module "kubernetes" {
  source = "scholzj/kubernetes/aws"

  aws_region    = "eu-central-1"
  cluster_name  = "aws-kubernetes"
  master_instance_type = "t2.medium"
  worker_instance_type = "t2.medium"
  ssh_public_key = "~/.ssh/id_rsa.pub"
  ssh_access_cidr = ["0.0.0.0/0"]
  api_access_cidr = ["0.0.0.0/0"]
  min_worker_count = 3
  max_worker_count = 6
  hosted_zone = "my-domain.com"
  hosted_zone_private = false

  master_subnet_id = "subnet-8a3517f8"
  worker_subnet_ids = [		
      "subnet-8a3517f8",
      "subnet-9b7853f7",
      "subnet-8g9sdfv8"
  ]
  
  # Tags
  tags = {
    Application = "AWS-Kubernetes"
  }

  # Tags in a different format for Auto Scaling Group
  tags2 = [
    {
      key                 = "Application"
      value               = "AWS-Kubernetes"
      propagate_at_launch = true
    }
  ]
  
  addons = [
    "https://raw.githubusercontent.com/scholzj/terraform-aws-kubernetes/master/addons/storage-class.yaml",
    "https://raw.githubusercontent.com/scholzj/terraform-aws-kubernetes/master/addons/heapster.yaml",
    "https://raw.githubusercontent.com/scholzj/terraform-aws-kubernetes/master/addons/dashboard.yaml",
    "https://raw.githubusercontent.com/scholzj/terraform-aws-kubernetes/master/addons/external-dns.yaml",
    "https://raw.githubusercontent.com/scholzj/terraform-aws-kubernetes/master/addons/autoscaler.yaml"
  ]
}

An example of how to include this can be found in the examples dir.

Addons

Currently, following addons are supported:

Kubernetes dashboard
Heapster for resource monitoring
Storage class for automatic provisioning of persisitent volumes
External DNS (Replaces Route53 mapper)
Ingress
Autoscaler
Logging with Fluentd + ElasticSearch + Kibana

The addons will be installed automatically based on the Terraform variables.

Custom addons

Custom addons can be added if needed. For every URL in the addons list, the initialization scripts will automatically call kubectl -f apply <Addon URL> to deploy it. The cluster is using RBAC. So the custom addons have to be RBAC ready.

Tagging

If you need to tag resources created by your Kubernetes cluster (EBS volumes, ELB load balancers etc.) check this AWS Lambda function which can do the tagging.

Jamie-BitFlight / terraform-aws-kubernetes